75 ft (23 m) Nylon 5/8 in (16 mm) diameter rope lifeline with carabiner at one end, taped at other. Nylon rope provides resistance to UV, wear and shock, making it a great choice for long-term use even in harsh environments. Vertical lifelines and vertical lifeline subsystems are intended to be used as part of a personal fall arrest or restraint system. These lifelines and lifeline subsystems are not designed for use in horizontal lifeline systems.